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The command-line simulator (sim30.exe) included with the tools may be used to test and debug C or assembly-language programs. The simulator supports the complete PIC24/dsPIC instruction set, and a restricted set of peripherals (two UARTS, five General Purpose Timers, 10-bit A/D converter, 12-bit A/D converter, PWM, Input Capture, Input Change Notification, I/O ports, Data RAM, Program Flash, Data EEPROM, and an Interrupt Controller).
As described in the user's guides, all of the language tools are sensitive to case on the command-line, including the case of file names. In particular, the C compiler shell (pic30-gcc) requires that C source files be named on the command-line with a lower-case .c extension. If an upper-case .C filename extension is used, the compiler assumes that the file is a C++ file, which is not supported.
With the exceptions noted below, the 16-bit tools are written and distributed under the GNU General Public License (GPL) which means that its source code is freely distributed and available to the public.
The source for the tools under the GNU GPL may be downloaded separately from the Microchip WWW web page. You may read the GNU GPL in the file named COPYING located the top level of your install directory. A general discussion of principles underlying the GPL may be found at www.gnu.org/copyleft.
If you have previously installed a Student, Demo, or Lite version of MPLAB C30 and you wish to upgrade your current installation there is no need to re-run the installer unless you also wish to upgrade the currently installed product to the latest release. Once you have obtained a valid license key, from www.microchipdirect.com for example,simply execute the following command line: pic30-lm -ulicensekey
In addition to these manuals, a set of HTML documentation for peripheral and DSP libraries is also included. This documentation covers all supported devices, even if only a subset product is installed.
v3.25 contains several new features to help reduce code size in certainkinds of applications:
- New version of Lib C which has a generally smaller footprint than previous the lib C. Microchip is in the process of standardizing to one lib C across all compilers to aid in end user portability. Please see Migration Issues for more information.
We have fixed a number of issues that were introduced with v3.20 and the__eds__ qualifier support. Also with v3.20 the groundwork fortracking PSVPAG/DSRPAG usage so that we may better optimize (in a future release) writing to these SSRs caused a few regressions which have been cleanedup.
A welcome new feature is faster single and double floating point. Our original libraries were primarily created for small code size and are notparticularly fast. The new libraries consume a little more FLASH but are muchfaster - as usual there is always a trade-off. These new libraries can belinked in with a new command line option -fast-math.
New section attribute page to indicate that a section must not cross a natural page boundary. It ensures that a single setting of the page register is sufficient to access the entire section. The page attribute modifies sections of type bss, data, persist, code, psv, and eedata. In the case of psv, the page attribute is redundant, since by definition sections of type psv avoid page boundaries.
New operator edspage() can be applied to symbols in data memory or program memory. It returns the page value that can be used to make the object visible in the extended data space window. edspage() always returns a 10-bit result.
New operator edsoffset() can be applied to symbols in data memory or program memory. It returns a 16-bit offset that can be used in combination with an object's page value. For objects located in the first 32K of data memory, edsoffset() returns the object's true address. For all other objects, it returns an address in the PSV or extended data space window.
Feature preprocessor definitions which can be used to identify special properties of the different 16-bit devices. Definitions such as __HAS_DSP can be tested by assembler preprocessor directives. A complete list of definitions may be found in chapter 5.9, "Predefined Symbols", in the Assembler manual.
New linker script commands specify startup files. On some future devices PSVPAG is no longer used to access constants stored in program memory. On such devices the standard startup files can not be used. In order to support multiple startup files, new commands specify files appropriate for the target device. For example:
These commands replace the EXTERN() commands which previously appeared near the top of linker scripts. See Migration Issues for more information.
- Linker scripts are now pre-processed using the standard C pre-processor. Macros can be defined in the Build Options dialogue of MPLAB IDE.
To accommodate future devices with extended data memory, the data initialization template has been modified to encode page numbers. For more information, see chapter 10.8, "Initialized Data", in the Linker manual.
Object files now contain signatures for the purpose of matching objects created with different compiler options. In the current release, objects loaded from libraries are selected to ensure consistent setting of the -mlarge-arrays option. Two new linker options have been added to control this feature:
The memory usage report (which appears in the map file as well as console output) has changed in two ways. First, sections marked noload will now appear in the report, and will count towards the total memory used. In the unusual case where two noload sections have been declared at the same address, the total memory value will be distorted.
Second, the Program Memory report will only show sections actually defined in memory region "program". Previously, the reset vector and interrupt vector tables were included in this section of the report. However, these sections are defined in separate memory regions, and their appearance in the report can be confusing since these sections are not really part of the application code, which is otherwise variable in size.
The disassembly listing generated by pic30-objdump has been improved. Instead of representing the target address of branch and DO instructions as a PC-relative offset (using a "dot expression"), the absolute target address will be displayed. If a label at the target address can be identified, it will be displayed also. For example, a previous listing:
A customer can determine if this update has been installed by examining the compiler version string. A version string is displayed by executing the following command: pic30-gcc --version The version string before update is: (dsPIC30, Microchip v3.11) (A) The version string after update is: (dsPIC30, Microchip v3.11) (B) v3.11 Support for erasing and programming Flash and EEPROM memory in PIC24FxxKA devices has been added to the runtime libraries. See Documentation Updates for details.
Additional software delay functions have been added for simple delay loops specified in microseconds or milliseconds. The implementation is dependant on a user-supplied macro that represents the instruction clock frequency. See Documentation Updates for details.
The default stack guard band has been increased from 8 to 16 bytes, to adequately handle stack overflow exceptions that may occur from certain instruction sequences. The size of the guard band can also be specified with a new linker option. See Migration Issues for details.
Due to changes in the GCC source base, fixed register assignments such as: register int foobar("w11"); may generate unexpected code, especially under optimization. Fixed register assignments will be deprecated in the next release of the compiler.
C30 V3.30 uses a consistent naming convention for all support files. Previousreleases used lower case for dsPIC30F devices and uppercase for other devices.We have standardized on upper case names, like:
Support files (header files, linker files, and include files) are now machine generated and are consistent with the IDE and other tools that requiredevice information. Microchip has made every effort to ensure that these filesare consistent with previous releases. As a backup, we have provided a .zipfile with support files from v3.25 install inside the /src directory. This .zip file does not have support for new devices supported bythis compiler.
The default version of _DefaultInterrupt() has been modified to include a software break instruction. This will have the benefit of ensuring that the debugger will stop if the this function is reached, instead of simply resetting the device. Without a debugger attached, the device will still reset. However, for production code, we always recommend that an application specific _DefaultInterrupt() be provided.
Linker scripts provided with v3.20 include new commands to specify start-up files for the target device. If these commands are not found, the linker will select default versions. Existing projects with custom linker scripts will function correctly for all current devices. However, the following warning messages may be displayed:
The tblpage() operator now returns a value with bit 8 set, even though the TBLPAG register implements bits 0-7 only. The extra bit allows for better code generation by the compiler. Existing projects should not be affected by this change, unless an assembly source file uses the tblpage() operator with a mov.b instruction. In that case, a "relocation truncated to fit" error may be reported. To resolve this problem, revise the assembly source to use a word sized instruction.
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